Abstract
The rates of transpiration from the upper and lower surfaces of leaves of Gossypium hirsutum, Xanthium strumarium, and Zea mays were compared with the rates at which helium diffused across those leaves. There was no evidence for effects of CO(2) concentration or rate of evaporation on the resistance to water loss from the evaporating surface ("resistance of the mesophyll wall to transpiration") and no evidence for any significant wall resistance in turgid tissues. The possible existence of a wall resistance was also tested in leaves of Commelina communis and Tulipa gesneriana whose epidermis could be easily peeled. Only when an epidermis was removed from a leaf, evaporation from the mesophyll tissue declined. We conclude that under conditions relevant to studies of stomatal behavior, the water vapor pressure at the sites of evaporation is equal to the saturation vapor pressure.
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Claims 4
Claim · model-written summary
CO2 concentration and evaporation rate had no detectable effect on the resistance to water loss from the evaporating surface.
- Taxon
- Gossypium hirsutum, Xanthium strumarium, and Zea mays
Gossypium hirsutum
Zea mays
Xanthium strumariume0 - Treatment
- CO(2) concentration or rate of evaporatione1
- Outcome
- resistance to water losse1
- Direction
- no evidence for effectse1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“leaves of Gossypium hirsutum, Xanthium strumarium, and Zea mays were compared with the rates at which helium diffused across those leaves”
e1“There was no evidence for effects of CO(2) concentration or rate of evaporation on the resistance to water loss from the evaporating surface”
Claim · model-written summary
No significant wall resistance to water loss was found in turgid leaf tissues.
- Taxon
- Gossypium hirsutum, Xanthium strumarium, and Zea maysGossypium hirsutumZea maysXanthium strumariume0
- Outcome
- wall resistance in turgid tissuese2
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“leaves of Gossypium hirsutum, Xanthium strumarium, and Zea mays were compared with the rates at which helium diffused across those leaves”
e2“no evidence for any significant wall resistance in turgid tissues”
Claim · model-written summary
When the epidermis was removed, evaporation from the mesophyll tissue declined in Commelina communis and Tulipa gesneriana leaves.
- Taxon
- Commelina communis and Tulipa gesneriana
Commelina communis
Tulipa gesnerianae3 - Treatment
- epidermis was removede4
- Outcome
- evaporation from the mesophyll tissuee4
- Direction
- declinede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“The possible existence of a wall resistance was also tested in leaves of Commelina communis and Tulipa gesneriana whose epidermis could be easily peeled”
e4“Only when an epidermis was removed from a leaf, evaporation from the mesophyll tissue declined”
Claim · model-written summary
The authors conclude that the water vapor pressure at the sites of evaporation equals the saturation vapor pressure under stomatal-study conditions.
- Taxon
- Gossypium hirsutum, Xanthium strumarium, and Zea maysGossypium hirsutumZea maysXanthium strumariume0
- Outcome
- water vapor pressure at the sites of evaporatione5
- Qualifier
- is equal to the saturation vapor pressuree5
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“leaves of Gossypium hirsutum, Xanthium strumarium, and Zea mays were compared with the rates at which helium diffused across those leaves”
e5“the water vapor pressure at the sites of evaporation is equal to the saturation vapor pressure”
The same questions in other papers
co2 · physiology: water · Gossypium hirsutum (cotton)Positive and negative results
1 paper in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- no effect
co2 · physiology: water · Zea mays (maize)Positive and negative results
4 papers in the same direction as this paper · 16 in the opposite direction
- positive
- positive
- positive
17 papers more in this group
See all 21 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.